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Ivory Tower

From Diablo Wiki

Ivory Tower is a legendary shield in Diablo 3 and Reaper of Souls. This item can be found and equipped by any class, though shields are used mostly by Crusaders (around 80%), occasionally by Barbarians and Monks, and almost never by Wizards, Witch Doctors, and Demon Hunters.

The Smart Drop system ensures that this shield will usually roll with the mainstat appropriate to the class that finds it. Shields do not roll with +skill bonuses as random primary affixes.

The item design and lore reference the Crystal Arch, a prominent feature of architecture within the High Heavens. The Crystal Arch is what Diablo shatters after defeating Imperius in the opening cinematic for Act Four.